photodiode module most sensitive to environmental light intensity , generally used to detect the ambient brightness and light intensity , can be common with photosensitive resistance sensor module in most cases , the difference between the two is that a better directional photodiode module , you can sensing light in a fixed direction .

module dull conditions or when the light intensity of less than the set threshold , DO port output high when the ambient light intensity exceeds a set threshold, the module output low in D0 ;

digital outputs D0 can be directly connected with the microcontroller through the microcontroller to detect high and low , thereby detecting the light intensity changes in the environment ;

4.digital outputs can directly drive DO OUR relay module , which can be composed of a photoelectric switch ;

5.AO analog output modules can be connected and shop AD through the AD converter , you can get a more accurate light intensity values ;